Why is there no dark_skin (or similar) tag? I saw a picture one or two days ago tagged like this and was like "yay, someone finally tagged it like this" but now the tag is gone again...

Is there any reason for this? I mean it seems to be allowed to upload these kind of pictures, why not tag them correctly?

There are many tags we don't use and dark_skin is one of them.

A little about past history: There was a mass tag deletion in the past. New tags are being monitored. Tags that won't get many images will get eliminated.

Thus, how should I call it... pointless tag? Unless you are refering to a tanned person. We have tan_lines for that.

Unlike other 'booru-based sites (Yande.re, Sankaku Channel, the original Danbooru, Gelbooru, etc.), we don't try to tag everything under the sun and then some.

Also, there's a whole thread for discussing tags here, if you didn't notice.